Space shuttle

Space shuttle, also called Space Transportation System, partially reusable rocket-launched vehicle designed to go into orbit around Earth, to transport people and cargo to and from orbiting spacecraft, and to glide to a runway landing on its return to Earth’s surface that was developed by the U.S. National Aeronautics and Space Administration (NASA). Formally called the Space Transportation System (STS), it lifted off into space for the first time on April 12, 1981, and made 135 flights until the program ended in 2011.

space shuttle: Takeoff and landingThis video shows a takeoff and landing of a manned U.S. space shuttle. The shuttle's main components are a winged orbiter, a large external tank that carries the liquid fuel and oxidizer for the orbiter's three main engines, and two solid-fuel rocket boosters mounted on the sides of the external tank. The shuttle orbiter is a reusable spacecraft that reenters the atmosphere, makes an unpowered descent, and lands on a runway much like an airplane.NASA

The U.S. space shuttle consisted of three major components: a winged orbiter that carried both crew and cargo; an external tank containing liquid hydrogen (fuel) and liquid oxygen (oxidizer) for the orbiter’s three main rocket engines; and a pair of large, solid-propellant, strap-on booster rockets. At liftoff the entire system weighed 2 million kilograms (4.4 million pounds) and stood 56 metres (184 feet) high. During launch the boosters and the orbiter’s main engines fired together, producing about 31,000 kilonewtons (7 million pounds) of thrust. The boosters were jettisoned about two minutes after liftoff and were returned to Earth by parachute for reuse. After attaining 99 percent of its orbital velocity, the orbiter had exhausted the propellants in the external tank. It released the tank, which disintegrated on reentering the atmosphere. Although the orbiter lifted off vertically like an expendable rocket launcher, it made an unpowered descent and landing similar to a glider.

U.S. space shuttle, composed of a winged orbiter, an external liquid-propellant tank, and two solid-fuel rocket boosters.Encyclopædia Britannica, Inc.

space shuttleDiagram of a space shuttle.Encyclopædia Britannica, Inc.

The space shuttle could transport satellites and other craft in the orbiter’s cargo bay for deployment in space. It also could rendezvous with orbiting spacecraft to allow astronauts to service, resupply, or board them or to retrieve them for return to Earth. Moreover, the orbiter could serve as a space platform for conducting experiments and making observations of Earth and cosmic objects for as long as about two weeks. On some missions it carried a European-built pressurized facility called Spacelab, in which shuttle crew members conducted biological and physical research in weightless conditions.

space shuttle: Challenger, 1984Open cargo bay of the shuttle orbiter Challenger, photographed February 7, 1984, by astronaut Bruce McCandless during a test of the manned maneuvering unit, a jet-powered backpack that allows spacewalking astronauts to make powered excursions from their craft.NASA

Spacelab 1West German physicist-astronaut Ulf Merbold conducting a materials-processing experiment aboard Spacelab, carried into orbit in the payload bay of the space shuttle orbiter Columbia. The shuttle mission was launched November 28, 1983.NASA

Designed to be reflown as many as 100 times, the U.S. space shuttle originally had been expected to reduce the high cost of spaceflight into low Earth orbit. After the system became operational, however, the vehicle’s operating costs and the time needed for refurbishment between flights proved to be significantly higher than early projections. Between 1981 and 1985 a fleet of four orbiters—Columbia (the first to fly in space), Challenger, Discovery, and Atlantis—was put into service.

Seventh launch of the space shuttle and second liftoff of Challenger, on June 18, 1983. The success of NASA's programs had become almost routine by the 1980s.NASA

Liftoff and landing of Columbia, the first space shuttle, April 12–14, 1981.Encyclopædia Britannica, Inc.

On January 28, 1986, Challenger, carrying seven astronauts, exploded shortly after liftoff, killing all aboard including a private citizen, schoolteacher Christa McAuliffe. The presidential commission appointed to investigate the accident determined that a joint seal in one of the solid rocket boosters had failed as a result of mechanical design problems, which were exacerbated by the unusually cold weather on the morning of the launch. Hot gases leaking from the joint eventually ignited the fuel in the shuttle’s external tank, causing the explosion. After the accident, the shuttle fleet was grounded until September 1988 to allow NASA to correct the design flaws and implement associated administrative changes in the shuttle program. In 1992, Endeavour, a replacement orbiter for the destroyed Challenger, flew its first mission.

Between 1995 and 1998, NASA conducted a series of shuttle missions to the orbiting Russian space stationMir to give the agency experience in station operations in anticipation of the construction of the modular International Space Station (ISS). Beginning in 1998, the shuttle was used extensively to take components of the ISS into orbit for assembly and to ferry astronaut crews and supplies to and from the station.

U.S. astronaut Peggy Whitson (right), Expedition 16 commander, greeting astronaut Pam Melroy, STS-120 commander, after the opening of the hatch between the International Space Station and the space shuttle Discovery, Oct. 25, 2007.NASA

DiscoveryThe space shuttle Discovery preparing to dock with the International Space Station, July 2006.NASA

On February 1, 2003, Columbia broke up catastrophically over north-central Texas at an altitude of about 60 km (40 miles) as it was returning from an orbital mission. All seven crew members died, including Ilan Ramon, the first Israeli astronaut to go into space. (SeeColumbia disaster.) Once again the shuttle fleet was immediately grounded. The accident investigation board concluded that, during the launch of the shuttle, a piece of insulating foam had torn from the external tank and struck the orbiter’s left wing, weakening its thermal protection ability. When the orbiter later reentered the atmosphere, it was unable to withstand the superheated air, which penetrated the wing and destroyed it, leading to the vehicle’s breakup. As in the analysis of the Challenger disaster, the Columbia accident was seen as the result of both mechanical and organizational causes that needed to be addressed before shuttle flights could resume.

Streaks of burning debris from the U.S. space shuttle orbiter Columbia as it broke up over Texas on February 1, 2003. The accident killed all seven astronauts aboard the craft. Dr. Scott Lieberman—AP Photo/Tyler Morning Telegraph

U.S. space shuttle DiscoveryLaunch of the U.S. space shuttle Discovery, July 2006.Gianni Woods/NASA

Space shuttle flights resumed on July 26, 2005, with the launch of Discovery. The last space shuttle flight, the 135th, was launched on July 8, 2011. NASA announced that subsequent crewed missions would use the Russian Soyuz spacecraft as well as spacecraft built by American companies. The three remaining orbiters, as well as Enterprise (which did not fly into space but was only used in landing tests in 1977), were placed in museums across the United States. (For additional information on the space shuttle, seespace exploration.)